The traditional viewpoint of existing heating process and neglecting melting phenomena in welding results in the error of considering compressive plastic strain in welding.
由于认为焊缝存在加热过程和忽视熔化现象的存在，导致传统观点认为的焊缝存在压缩塑性应变的错误。
Then, constitutive equations are written for plastic, creep and fatigue damage phenomena.
从而建立了塑性、蠕变和疲劳损伤现象的本构方程。
Having analyzed leakage phenomena easily occurred in plastic doors and Windows, the article makes some Suggestions on how to solve the problems comprehensively.
分析了普通塑料门窗易出现的几种渗漏现象，提出了综合解决门窗防排水问题的几个建议。
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